The team did not say who would replace Morton in the starting rotation, but a likely option is Gerrit Cole, who has been on the DL since July 9 with a sore lat. Cole pitched seven scoreless innings in a rehab start for Triple-A Indianapolis Friday night.

Infielder Brent Morel was recalled from Indianapolis to take Morton's spot on the 25-man roster.

Pittsburgh has lost four games in a row to fall 4 1/2 games out of first place in the NL Central and a half-game behind San Francisco in the wild-card standings.